Microsoft AI Updates: September 29, 2026

1. GitHub Copilot Made Claude Sonnet 5.5 Generally Available

Microsoft. GitHub added Anthropic’s Claude Sonnet 5.5 to Copilot as a generally available model for Pro, Pro+, Max, Business, and Enterprise users, selectable in VS Code, Visual Studio, Copilot CLI, the coding agent, JetBrains IDEs, Xcode, Eclipse, github.com, and mobile. GitHub says early testing showed coding performance on par with Claude Sonnet 5 while using significantly fewer steps, tokens, and tool calls, with faster task completion. The model is billed at provider list pricing under usage-based billing, and Business and Enterprise admins can control access through the Copilot model policy. Source